Early engine part id
 

I need a little bit of help identifying some parts from an engine I am trying to rebuild.

The case says the engine is a 911/04, which makes it a 1970 2.2 E, for the sportomatic.

Trouble is, the part numbers for some of the main components don't exactly match what online sources give me.

What I have: heads: p/n 911 104 306 0R, other numbers: 15 3-70 K1819g. I imagine that the 3-70 means it was cast in March 1970.

Rods: 911 103 103 0R, other number on the flip side: 20 31033 K

Cam: 901-105-191-0R

The pistons and cylinders on the engine are 84 mm.

Any help with exact identification would be greatly appreciated.